<template>
    <div class="app-header-sticky" :class="{show: y >= 78}">
        <div class="container" v-show="y >= 78">
            <router-link class="logo" to="/"></router-link>
            <AppHeaderNav></AppHeaderNav>
            <div class="right">
                <router-link to="/">品牌</router-link>
                <router-link to="/">专题</router-link>
            </div>
        </div>
    </div>
</template>

<script>
import AppHeaderNav from './AppHeaderNav.vue'
// import { ref, onMounted} from 'vue'
import { useWindowScroll } from '@vueuse/core'
export default {
    name: 'AppHeaderSticky',
    components: { AppHeaderNav },
    setup() {
        // const y = ref(0)
        // // onMounted(() =>{
        // //     // 窗口发生滚动事件执行回调
        // //     window.onscroll = () => {
        // //         // 元素内容垂直方向滚动的像素值
        // //         const scrollTop = document.documentElement.scrollTop
        // //         y.value = scrollTop
        // //     }
        // // })
        // useWindowScroll可返回当前页面滚动时候蜷曲的响应式距离值，x横向，y纵向，解构赋值得到纵向距离
        const { y } = useWindowScroll()
        return {
            y,
        }
    }
}
</script>

<style scoped lang='less'>
.app-header-sticky {
    width: 100%;
    height: 80px;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
    background-color: #fff;
    border-bottom: 1px solid #e4e4e4;
    transform: translateY(-100%);
    opacity: 0;
    &.show {
        transition: all 0.3s linear;
        transform: none;
        opacity: 1;
    }
    .container {
        display: flex;
        align-items: center;
    }

    .logo {
        width: 200px;
        height: 80px;
        background: url(../assets/images/logo.png) no-repeat right 2px;
        background-size: 160px auto;
    }

    .right {
        width: 220px;
        display: flex;
        text-align: center;
        padding-left: 40px;
        border-left: 2px solid @xtxColor;

        a {
            width: 38px;
            margin-right: 40px;
            font-size: 16px;
            line-height: 1;
            &:hover {
                color: @xtxColor;
            }
        }
    }
}</style>